Crowding, the difficulty in identifying a letter embedded in other letters, has been suggested as an explanation for slow reading in peripheral vision. In this study, we asked whether crowding in peripheral vision can be reduced through training on identifying crowded letters, and if so, whether these changes will lead to improved peripheral reading speed. We measured the spatial extent of crow...

BACKGROUND Fungal keratitis has been rarely reported following intracorneal ring segment (ICRS) inmplantation. This paper aims to report a case of fungal keratitis with aspergillus fumigatus following ICRS implantation for correction of keratoconus. METHODS A retrospective chart review was done. Data including demographics, clinical history and presentation, microbiological analysis as well a...

Specific blue-yellow colour vision impairment has been reported in dependent cocaine users and it was postulated that drug-induced changes in retinal dopamine neurotransmission are responsible. However, it is unclear whether these changes are confined to chronic cocaine users, whether they are specific for dopaminergic stimulants such as cocaine and amphetamine and whether they are related to c...

Central vision is substantially over represented in the lateral geniculate nucleus (dLGN) and striate cortex. The over representation could be accompanied by a selective expansion of central vision in parvocellular dLGN, in which case the ratio of parvocellular to magnocellular inputs to striate cortex should change with retinal eccentricity. To test this, sample ratios were determined from cou...

Selective attention contributes to perceptual efficiency by modulating cortical activity according to task demands. Visual attention is controlled by activity in posterior parietal and superior frontal cortices, but little is known about the neural basis of attentional control within and between other sensory modalities. We examined human brain activity during attention shifts between vision an...

The epiretinal membrane (ERM) is semitransparent; fibrocellular membrane found on the inner surface of the internal limiting membrane (ILM) at the macula [1]. ERM most commonly take place in the elderly population and can lead to distortion, blurring of vision, and in some patients severe vision loss [13]. ERM formation may lead to visual inconveniences, such as metamorphopsia, photopsia, blurr...

Orbital floor fractures are generally the result of blowout orbital and may be associated with orbital emphysema leading to proptosis and even to loss of vision. A 49-year-old woman fractured the orbital floor in a fall. After blowing her nose, she developed exophthalmos and severe reduction in vision. She consulted our department and underwent emergency surgical management with orbital drainag...

Sadri B1, Nadri S2, Poosti B3, Mahmoudvand H4 1. Assistant professor, Department of Anesthesiology, Faculty of medicine, Iran University of medical sciences 2. Assistant professor, Department of Anesthesiology, Faculty of medicine, Lorestan University of medical sciences 3. 1. Assistant professor, Department of ENT, Faculty of medicine, Iran University of medical sciences 4. General pract...